Process for decabromodiphenylalkane predominant product
DCFirst Claim
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1. A process for preparing a flame retardant product predominant in decabromodiphenylalkane, the process comprising:
- forming a stirrable first reaction mass by feeding molten diphenylalkane to a reaction vessel to which a bromination catalyst and bromine had been previously charged;
maintaining the first reaction mass at a temperature in the range of from about 0°
C. to about reflux during the feeding;
subsequent to the feeding, separating the decabromodiphenylalkane predominant product from the bromine and catalyst;
forming a stirrable second reaction mass from the separated product and a treatment solution; and
maintaining the second reaction mass for a period of time and at a temperature which is sufficient to obtain the decabromodiphenylalkane predominant product.
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Abstract
This invention relates to a white or at least near white flame retardant product which is predominant in decarbromodiphenylalkane, and which product contains a minor amount of impurities; to a process for preparation of the flame retardant product; to a process for the removal of excess bromine from the product by use of a treatment solution and elevated temperature; and to macromolecular materials utilizing the product as a flame retardant.
46 Citations
24 Claims
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1. A process for preparing a flame retardant product predominant in decabromodiphenylalkane, the process comprising:
- forming a stirrable first reaction mass by feeding molten diphenylalkane to a reaction vessel to which a bromination catalyst and bromine had been previously charged;
maintaining the first reaction mass at a temperature in the range of from about 0°
C. to about reflux during the feeding;
subsequent to the feeding, separating the decabromodiphenylalkane predominant product from the bromine and catalyst;
forming a stirrable second reaction mass from the separated product and a treatment solution; and
maintaining the second reaction mass for a period of time and at a temperature which is sufficient to obtain the decabromodiphenylalkane predominant product. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- forming a stirrable first reaction mass by feeding molten diphenylalkane to a reaction vessel to which a bromination catalyst and bromine had been previously charged;
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12. A process for preparing a flame retardant product predominant in decabromodiphenylethane, the process comprising:
- forming a stirrable first reaction mass by feeding molten 1,2-diphenylethane to a reaction vessel to which a bromination catalyst and bromine had been previously charged, the molten 1,2-diphenylethane having a purity of at least 99.5 weight percent and being maintained under a non-oxidizing atmosphere prior to the feeding, and the bromine being charged in an amount which provides from about 18 to about 23 moles of bromine per mole of 1,2-diphenylethane fed;
maintaining the first reaction mass at a temperature in the range of from about 15°
C. to about reflux during the feeding;
separating the decabromodiphenylethane predominant product from the bromine and catalyst;
forming a stirrable second reaction mass from the separated product and a treatment solution; and
maintaining the second reaction mass for a period of time and at a temperature which is sufficient to obtain the decabromodiphenylethane predominant product. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
- forming a stirrable first reaction mass by feeding molten 1,2-diphenylethane to a reaction vessel to which a bromination catalyst and bromine had been previously charged, the molten 1,2-diphenylethane having a purity of at least 99.5 weight percent and being maintained under a non-oxidizing atmosphere prior to the feeding, and the bromine being charged in an amount which provides from about 18 to about 23 moles of bromine per mole of 1,2-diphenylethane fed;
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20. A process for enhancing the purity of a decabromodiphenylalkane predominant product containing, at least initially, excess bromine, the process comprising:
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a) forming a stirrable reaction mass, the reaction mass comprising a decabromodiphenylalkane predominant product containing excess bromine as an impurity, and a treatment solution; and b) maintaining the reaction mass for a period of time and at a temperature which is sufficient to obtain the enhanced decabromodiphenylalkane predominant product containing less than about 100 ppm excess bromine. - View Dependent Claims (21, 22, 23, 24)
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Specification